IBM Extent Pool Summary
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Capacity Manager > Array Capacity & Utilization > IBM Extent Pool Summary
Understanding IBM Enterprise Storage Capacity Calculations
• Capacity values for IBM arrays may appear different from what is reported by the IBM CLI or IBM Tools, as IBM uses a decimal gigabyte—10^9 bytes, while StorageConsole uses 1024 for a KB when converting to GB.
• For FB open systems hosts, an extent is 1 GB. For CKD IBM zSeries or S/390 systems, an extent is 1 cylinder (.92 GB).
In the Scope Selector, you can narrow the report output by selecting values for the following criteria:
• Storage Types: fb, ckd
• Rank Status: below, exceeded, full
Name | Extent Pool name |
Storage System | The physical storage system (storage array) on which the extent pool resides |
Rank Group | A rank can only be assigned to one extent pool, but more than one rank can reside in an extent pool. |
Storage Type | Fixed block (FB) or Count-Key-Data (CKD).For FB, an extent is 1 GB. For CKD, an extent is 1 cylinder (.92 GB). |
Status | Rank Status:
below - % of available extents is less than threshold
exceeded - % of available extents is greater than threshold
full - 0 extents are available |
Total Capacity | Sum of the capacity of all extents in this pool |
Available Capacity | The amount of space in this extent pool that is currently available; this value is derived from the total capacity minus the allocated capacity |
Available Extents | The number of extents that are available to the logical volume |
Reserved Extents | The number of extents that are in reserved (this space must be explicitly released before the logical volume can use it) |
# of Volumes | The number of logical volumes that have been configured from this extent pool; this is the storage that can be given to a host |
# of Ranks | The number of ranks in this extent pool—1 or 2 |